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Introduction. Believe it or not oxygen is a highly toxic substance. Some forms are more toxic than others.Use of oxygen, or in some cases merely surviving in its presence requires mechanisms to deal with oxygen toxicity.Charged, electron withdrawing oxygen free radicals are referred to as reactive oxygen species (ROS). ROS are potent oxidants that can at least break bonds and cause damaging mutations (sometimes carcinogenic).All organisms capable of aerobic respiration depend on 2 protectiv197

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